KR100892456B1 - Corrosion-resistant and ultra-hydrophilic thin film coated metal product - Google Patents

Abstract

The present invention provides an HMDSO corrosion resistant thin film selectively formed on both sides of a metal matrix sheet in order to easily produce a refrigeration and air conditioning metal material having excellent hydrophilicity and aging characteristics and excellent corrosion resistance on an industrial production scale. Thereafter, a Ti-OC compound thin film having a superhydrophilic property is coated on a corrosion resistant thin film, and a method of manufacturing a superhydrophilic metal product manufactured by performing machining to a desired shape and a metal product having superhydrophilicity are provided.

Description

Corrosion and Super Hydrophilic Metal Products {CORROSION-RESISTANT AND ULTRA-HYDROPHILIC THIN FILM COATED METAL PRODUCT}

The present invention relates to corrosion resistant and superhydrophilic metal products.

Metal materials having a hydrophilic surface layer formed on the surface have been used very effectively throughout the industrial field. The present invention will be described by taking a heat exchanger as an example.

Heat exchangers that exchange heat by direct or indirect contact of two fluids with different temperatures are widely used in many industrial fields, and are particularly important in heating, air conditioning, power generation, waste heat recovery, and chemical processes.

Among these heat exchangers, the heat exchanger for refrigeration and air conditioning forms fins as expansion surfaces on the air side to improve heat transfer. When the air with humidity passes through the fin during heat exchange, heat transfer occurs due to the low temperature refrigerant supplied into the tube.When the temperature of the fin surface is below the dew point temperature of the air temperature with this humidity, water droplets form on the surface of the heat exchanger. This impedes the flow of water and thereby increases the pressure drop, the pressure difference between the heat exchanger inlet and outlet. Therefore, in order to supply the same flow rate, the power of the fan must be increased, which brings about power consumption.

In order to solve such a problem, conventionally, as shown in Japanese Patent Laid-Open No. 61-8598, an aluminum sheet of a heat exchanger fin was subjected to rust prevention treatment using Cr ⁺⁶ for corrosion resistance purposes, and then silicate thereon. (silicate) coating treatment has been performed to impart hydrophilicity to improve the flow of condensate formed on the fin surface. This is commonly referred to as PCM (pre-coated material).

However, in order to solve the corrosion resistance problem, the PCM is required for Cr ⁺⁶ , and since 2006, Cr ⁺⁶ cannot be used in 2006 due to environmental regulations. Therefore, development of a substitute material for Cr ⁺⁶ is required. It became. To date, Cr ^{+ 3} and resin types have been proposed. In addition, TCE (tetrachloroethane) which is inevitably used to clean aluminum during the manufacturing process of the PCM has also been accompanied by environmental pollution. In addition, the PCM initially exhibits excellent hydrophilic performance, but has a aging characteristic that gradually loses its hydrophilic property over time. In addition, in recent years, a lot of chemicals are used as a wallpaper material, and the silicate material for imparting hydrophilicity is chemically combined with the wallpaper to discolor the wallpaper. .

In addition, efforts have been made to satisfy various needs by forming functional (eg, hydrophilic or hydrophobic) surface layers in existing materials. Such a method of forming a functional surface layer can be classified into 1) depositing a functional surface layer on an existing material, and 2) modifying a surface film of an existing material to have new physical and chemical properties.

However, with the latter method, the problem of restoring the original surface properties after a certain time has been constantly raised because the surface properties change with time. For example, when the metal such as aluminum is treated by the ion beam assisted reaction method, it can be seen that the hydrophilicity of the metal surface is increased because the natural oxide film is removed through the etching phenomenon on the aluminum surface and the functional film is formed on the surface. In this case, the effect of increasing the hydrophilicity through the etching of the natural oxide film is that the growth of the oxide film in the natural state of the aluminum surface over time, the effect of enhancing the hydrophilicity is reduced and the functional film formed on the aluminum surface is extremely thin on the surface It is composed of a thick layer (<few nm) and has very low mechanical resistance to changes in the environment (water, temperature, etc.) over time, reducing the increased hydrophilic properties and restoring the original surface properties.

Because of these problems, efforts have been made to form functional surface layers, such as hydrophilicity or hydrophobicity, on metal materials that can maintain physically and chemically stable states.

As a part thereof, Japanese Laid-Open Patent Publication No. 2001-280879 discloses a heat exchanger having a fin made of a conductive metal material in a metal pipe serving as a passage for a refrigerant, and which contains a compound vapor containing titanium as a source gas. A plasma CVD technique is disclosed in which a heat exchanger coated with only a titanium oxide thin film coated on the surface of the fin is supplied so as to flow in parallel with the fin surface. The publication discloses that excellent hydrophilicity, antimicrobial activity and deodorization can be obtained through the heat exchanger.

However, the technique disclosed in the above publication is to deposit a titanium oxide thin film on the fin of the heat exchanger in a state in which the fin is mounted on the tube to form a heat exchanger, so that a thin film of uniform thickness cannot be expected on the entire surface of the fin. Hydrophilicity and aging characteristics are poor, and also there is a problem that does not guarantee the productivity enough to be directly applied to industrial production.

Accordingly, an object of the present invention is to provide a method for producing a superhydrophilic metal product having excellent hydrophilic performance and aging characteristics and excellent corrosion resistance and a metal product having superhydrophilicity.

In addition, an object of the present invention is to easily produce a superhydrophilic thin film on an industrial production scale by forming a thin film having corrosion resistance and superhydrophilicity on a sheet-shaped metal base material and then mechanically machining the metal base material into a desired shape. .

In addition, an object of the present invention is to uniformly form a thin film having effective corrosion resistance and superhydrophilicity on both surfaces of a sheet metal base material.

In addition, an object of the present invention is to continuously and sequentially form a thin film having effective corrosion resistance and superhydrophilicity on both surfaces of a sheet metal base material.

The present invention for achieving the above object, the coating of the corrosion-resistant thin film continuously using plasma on both sides of the sheet-shaped metal base material continuously supplied in the vacuum chamber, the corrosion-resistant thin film continuously supplied in the vacuum chamber A method of manufacturing a superhydrophilic metal product, characterized by continuously coating a superhydrophilic titanium compound thin film using plasma on both sides of a coated sheet metal base material, and machining the metal sheet coated with the thin films in order to a desired shape. To provide. In addition, the corrosion-resistant thin film is characterized in that the Si-O-based compound. In addition, the coating of the corrosion resistant thin film is characterized in that it is carried out by introducing a reactive gas, a gaseous silicon precursor and a carrier gas into the vacuum chamber. In addition, the introduction amount of the reactive gas, vapor phase silicon precursor and carrier gas is characterized in that it satisfies the range of 70 ~ 200 sccm, 700 ~ 1500 sccm, 700 ~ 2000 sccm, respectively.

In addition, the titanium compound thin film is characterized in that the Ti-O-based compound thin film. In addition, the titanium compound thin film is characterized in that the additional thin film containing C and / or H. In addition, the coating of the titanium compound thin film is characterized in that it is carried out by introducing a reactive gas, vapor phase titanium precursor and carrier gas into the vacuum chamber, the introduction amount of the reactive gas, vapor phase titanium precursor and carrier gas are each 1500 sccm, It is characterized in that about 1000 sccm, 800 sccm. In addition, the introduction ratio of the gases is characterized by satisfying the range of reactive gas: vapor phase titanium precursor: carrier gas = 3: 3: 1.

In addition, the reactive gas is characterized in that the air or O ₂ . The carrier gas may be at least one selected from the group consisting of He, N ₂ and Ar. In addition, the total thickness of the corrosion resistant thin film and the titanium compound thin film is characterized in that 1 to 200nm.

In addition, the metal base material is characterized in that the aluminum base material. In addition, the metal product is characterized in that the fin for the heat exchanger.

In another aspect, the present invention provides a metal product, characterized in that the plasma coating on the both sides of the coating, and a thin film of only the titanium compound is plasma coated on the corrosion-resistant thin film in order. Here, the corrosion-resistant thin film is characterized in that the Si-O-based compound thin film. In addition, the corrosion-resistant thin film is characterized by containing, in atomic%, 15 to 22% Si and 45 to 65% O. In addition, the titanium compound thin film is characterized in that the Ti-O-based compound thin film. In addition, the titanium compound thin film is characterized by containing 15 to 22% Ti and 45 to 65% O in atomic%. In addition, the titanium compound thin film is further characterized in that the thin film containing C and / or H. In addition, the titanium compound thin film, in atomic%, containing 15 to 22% Ti, 45 to 65% O, and additionally 20 to 25% C and / or 20 to 25% H characterized in that do.

In addition, the total thickness of the corrosion resistant thin film and the titanium compound thin film is characterized in that 1 to 200nm. In addition, the metal base material is characterized in that the aluminum base material, the metal sheet coated with the thin film is characterized in that it can be machined into a desired shape.

DETAILED DESCRIPTION Hereinafter, embodiments of the present invention in which the above object can be specifically realized are described with reference to the accompanying drawings.

Figure 1 shows a preferred embodiment of the plasma polymerization apparatus for producing a superhydrophilic refrigeration air conditioning metal product according to the present invention. In the case of using the plasma polymerizer configuration of FIG. 1, first, the corrosion-resistant Si-O-based compound thin film is continuously coated on both surfaces of the sheet-shaped metal base material, and then the hydrophilic Ti is coated on both surfaces of the sheet-shaped metal base material coated with the corrosion-resistant thin film. The OC-based compound thin film can be continuously coated. The polymerization apparatus is characterized in that after coating a corrosion-resistant thin film layer on a sheet-shaped metal base material, and subsequently coating a super-hydrophilic thin film layer, according to the coating chamber (2) divided by two first coating a corrosion-resistant thin film and then a super-hydrophilic thin film Coating sequentially.

First, the coating chamber 2 is connected to a vacuum pump not shown in the drawing for forming a vacuum in the chamber, and as shown in FIG. 1, the metal sheet 8 is continuously disposed between the electrodes 6 and 6a disposed up and down. ) Is supplied. After the corrosion resistant thin film was continuously coated on both sides of the metal sheet 8 by the plasma generated between the electrodes 6 and 6a, and then the superhydrophilic titanium compound thin film was continuously coated, the metal sheet 8 was It exits the coating chamber 2. Power sources 10 and 10a are applied to the electrodes 6 and 6a.

In addition, a reactive gas is introduced into the coating chamber 2 through the valves 22 and 22a from the reactive gas cylinders 20 and 20a, which preferably contain a reactive gas which may be air or oxygen.

In addition, a liquid phase of titanium tetraisopropoxide [Ti (OC ₃ H ₇ ) ₄ ] in a liquid state contained in the receiving containers 30 and 30a pressurized by the pressurizing portions 32 and 32a. Titanium precursor or liquid silicon precursor, HMDSO in the liquid state, is introduced into the vaporizers 40 and 40a by the pressure difference through the liquid mass flow controllers 38 and 38a, and vaporized through the vaporizers 40 and 40a. Vapor phase titanium precursor and vapor phase silicon precursor are also introduced into the coating chamber 2. At this time, a carrier gas, which may be helium, argon, and nitrogen, is introduced into the piping between the liquid MFCs 38 and 38a and the vaporizers 40 and 40a, so that the vapor phase titanium precursor and the vapor phase silicon precursor are introduced into the coating chamber. (2) We help to be introduced in. These carrier gases are accommodated in the carrier gas cylinders 50 and 50a and are introduced into the pipe via separate valves 52 and 52a. The vaporizers 40 and 40a have a structure in which heater coils 42 and 42a are wrapped and installed to heat and vaporize the liquid titanium precursor and the liquid silicon precursor.

At this time, the reactive gas, gaseous titanium precursor or gaseous silicon precursor and carrier gas are laminated outside the coating chamber 2 as shown in the drawing and through one pipe 60, 60a into the coating chamber 2. It may be introduced, or may be introduced into the coating chamber 2 through a separate pipe, and then laminated into one pipe inside the coating chamber 2. In Figure 1, the laminated pipe (60, 60a) is shown as a shape introduced through one hole of the coating chamber 2, the metal sheet (8) coated with the mixed gas introduced through the pipe (60, 60a) It is good to discharge directly and directly below.

However, since the vapor phase titanium precursor or vapor phase silicon precursor is condensed at a low temperature, when the pipes 60 and 60a are maintained at room temperature, the vapor phase titanium precursor or vapor phase silicon precursor condenses on the inner wall of the pipes 60 and 60a. have. Therefore, in order to prevent condensation of the vapor phase titanium precursor or vapor phase silicon precursor, it is preferable to wind the hot wires 64 and 64a on the outer wall of the pipe through which the vapor phase precursor gas flows and maintain the temperature above a predetermined temperature. The same applies to the pipes 66 and 66a in the region where the liquid titanium precursor or the liquid silicon precursor flows. The heating wires 68 and 68a are also wound around the outer walls of the pipes 66 and 66a to maintain a temperature above a predetermined temperature to prevent the titanium or silicon precursor from condensing on the inner walls of the pipes 66 and 66a.

In the above configuration, for example, the coating of the anti-corrosion thin film is immediately followed by coating the super-hydrophilic thin film, but in some cases, after performing the process of coating the corrosion-resistant thin film on the metal sheet (that is, unwinding the sheet After coating the thin film and rewinding the sheet into a roll), it is also possible to coat the superhydrophilic thin film by a separate process (in this case it will be possible to use one chamber). In addition, it may be possible to configure after installing the intermediate medium (for cooling process, etc.) between the separate chambers without continuously installing as described above.

The present invention first coats the corrosion-resistant Si-O-based compound thin film by using a plasma on the metal sheet 8 continuously supplied into the vacuum chamber 2 having the above-described configuration, and then the metal having the corrosion-resistant thin film coated thereon. Continuously coating a superhydrophilic Ti-O-based compound thin film on the sheet 8 using plasma, and machining the metal sheet coated with the thin film into a desired shape, for example, fins of a heat exchanger for refrigeration and air conditioning. To prepare.

Using a plasma polymerization apparatus having the above configuration, a metal sheet having superhydrophilicity was produced. These were machined into heat exchanger fin shapes as described above and their physical and surface properties were measured. This is illustrated in the description of the preferred embodiments below. However, the scope of the present invention should not be limited by the description of the embodiments described below, and the scope of the present invention will be limited only by the description of the claims which will be described later.

Example

plasma Of coating film  Produce

After forming a vacuum to 10 ^-3 Torr by using a vacuum pump in the vacuum chamber (2), the metal sheet (8) is connected to the anode (anode) and a constant distance (30 ~ 150 mm with the electrodes 6, 6a) ), And the heater coils 42 and 42a of the vaporizer were energized and heated (80 to 120 ° C) to vaporize the liquid precursor. Also, the heating wire (80-120 ° C.) was energized and heated to the outer wall of the pipes 60, 60a, 66, and 66a to prevent the titanium precursor and the silicon precursor from condensing on the inner wall of the pipe. The gas phase precursor gas, the carrier gas, and the reactive gas were respectively introduced into the vacuum chamber 2 through the pipes and discharged directly above and directly below the metal sheet 8. When the desired working vacuum degree is obtained by the injected gas, the power is turned "on" between the electrodes 6, 6a continuously formed in the flow direction of the metal sheet 8 with respect to the pipes 60, 60a. Plasma with mixed gases was formed. Accordingly, the corrosion-resistant (Si-OC) compound thin films and the superhydrophilic (Ti-OC) compound thin films were sequentially coated on both surfaces of the metal sheet 8.

In the plasma treatment, the current was 0.1 to 0.5 A, and in the plasma treatment, the vacuum degree in the chamber was 0.001 to 0.5 Torr. 1500sccm, the amount of gaseous silicon precursor, carrier gas and reactive gas introduced to form the corrosion resistant thin film is 700sccm: 700sccm: 70sccm, and the introduction ratio of reactive gas and carrier gas introduced to form the corrosion resistant thin film is 1:10 to 1 Maintaining about 20, the introduction ratio of the carrier gas and the vapor phase silicon precursor is 1: 1 to 1: 2.

Here, the plasma treatment time of the corrosion resistant thin film, as shown in Figure 2, the deposition rate (deposition rate) increases as the plasma treatment time increases. At this time, the deposition rate of the thin film is obtained by measuring the weight before and after the thin film formation of the metal sheet 8 or the specimen.

In addition, the corrosion resistance (EIS) according to the plasma treatment time of the corrosion resistant thin film, as shown in Figure 3, is proportional to the plasma treatment time and deposition rate. Corrosion performance was measured using an EIS meter.

Figure 4 shows the change in corrosion resistance according to the degree of vacuum, as shown, as a result of measuring the corrosion resistance at a vacuum degree of 0.2 Torr, 0.3 Torr, 0.5 Torr, the performance of the corrosion-resistant thin film at a vacuum degree of 0.3 Torr This turned out to be the best.

In addition, as a result of measuring the corrosion resistance by applying the carrier gases (He, N ₂ , O ₂ ) introduced at the time of forming the corrosion resistant thin film, as shown in FIG. 5, helium (He) as a carrier gas The corrosion resistance of the used one was the best and the deposition rate of helium was the best during the plasma treatment.

Composition and Thickness Analysis of Coated Thin Films

The composition of the treated thin film sample was analyzed by X-ray photoelectric spectroscopy (XPS), which infers the surface composition by measuring molecular specific absorption and emission wavelengths using X-rays, and the thickness was sputtered at a fixed speed. The composition was analyzed by AES (Atomic Emission Spectrometry). The results are shown in FIGS. 6 to 7.

6 is XPS data when the HMDSO corrosion resistant thin film is first formed and then the titanium compound thin film is formed. In atomic%, 19.4% C, 58.3% O, 2.5% Si, 19.8% Ti were analyzed. It was confirmed that the obtained compound thin film was a Ti-Si-O-C compound thin film.

That is, as a result of the analysis, there was a slight difference depending on the conditions, the titanium compound thin film according to the present invention commonly contained 15 to 22 atomic% Ti, 45 to 65 atomic% O and 20 to 25 atomic% Si. .

7 shows representative AES data. As described above, since the AES is to analyze the composition according to the depth while sputtering at a fixed speed, the thickness of the thin film can be analyzed. The thin film thickness of the AES data shown in FIG. 7 was 233 kW (23.3 nm). The thickness of the thin film according to the present invention was limited to the level of 100 ~ 1500 mm 3. The preferred thin film thickness is in the range of 200 to 400 kPa, and the total thickness of the superhydrophilic titanium compound thin film and the corrosion resistant silicon compound thin film is preferably 1 to 200 nm.

8 shows a scanning electron microscope (SEM) photograph of the Ti-Si-O-C compound thin film according to the present invention. As shown in the figure, it can be confirmed that a very dense thin film was obtained.

Evaluation of Corrosion Resistance of Thin Films

Corrosion resistance was in accordance with the Salt Spray Test according to KS D9502, which is a method for evaluating the corrosion resistance of metal materials or metal materials applied with plating, inorganic coating and organic coating. The salt concentration was 5 ± 1% and the temperature was 35 ± 2 ° C. Corrosion resistance was evaluated by visual observation.

Table 1. Evaluation of corrosion resistance by salt spray test

As can be seen from Table 1, in the case of the uncoated Bare Al sheet exhibited a front corrosion in each salt spray condition, it was confirmed that the corrosion resistance is very poor, the conventional PCM (Pre Coated Metal) employing a wet coating ) Also found that the number of corrosion defects as shown in the table, respectively, it was confirmed that they have a good corrosion resistance compared. However, in the case of the aluminum sheet coated with the titanium compound thin film according to the present invention, it was confirmed that the corrosion resistance is very excellent, and furthermore, after forming the silicon compound thin film coating layer and coating the titanium compound thin film thereon, extremely excellent corrosion resistance It could be confirmed that having.

9A and 9B show surface photographs after 15 days of a salt spray test for a sheet on which a Bare Al sheet and a sheet having a corrosion resistant and superhydrophilic HMDSO + Ti compound were formed. As can be seen from the figure, the front surface corrosion occurred in the Bare Al sheet shown in Fig. 9a, the pitting number is 10 in the sheet formed with the corrosion-resistant and super-hydrophilic compound thin film according to the present invention shown in Fig. 9b Less than dogs showed extremely good corrosion resistance.

Hydrophilicity of thin films and Aging  characteristic

Hydrophilicity evaluation was performed by dropping a quantitative (0.1 cc) drop of water at a height of 10 mm to measure the drop size on the sample surface. The better the hydrophilicity, the better the droplet's spread, and the larger the droplet's size. The hydrophobic, the smaller the droplet's spread, the smaller the droplet size. Figure 10a shows the shape of the water droplets on the surface having a hydrophilic water droplet size corresponds to 9 ~ 11 mm, Figure 10b shows the shape of water droplets on the surface having a hydrophobic water droplet size corresponds to 2 to 3 mm.

11 to 14 show the experimental results described above. Figure 11 shows the hydrophilic performance of coating only the corrosion resistant layer on the aluminum sheet specimens, and the coating of the corrosion resistant layer and the superhydrophilic layer, the specimen coated only the corrosion resistant layer has a hydrophobic characteristic of about 3mm, the corrosion resistant layer and the superhydrophilic The specimen coated with the layer showed hydrophilicity of 10.5 mm.

FIG. 12 shows that the treated specimens were repeatedly treated with distilled water for 10 minutes and 10 minutes of drying to evaluate the hydrophilic aging characteristics. The hydrophilic performance after 300 cycles was compared with the initial hydrophilic layer. In the case of coated specimens, it can be seen that there is no change in performance after 300 cycles of acceleration.

13 is a thin film according to the present invention treated by plasma after the acceleration of 300 cycles, but the hydrophilic performance is not changed, the conventional PCM is excellent hydrophilic performance, but the hydrophilic performance is lowered as the hydrophilic surfactant is dissolved in water aging It could be known. Bare Al is initially hydrophobic, but upon acceleration, an Al ₂ O ₃ oxide layer is formed on the surface of aluminum, resulting in slightly improved hydrophilic performance.

14 shows yet another result of aging experiments for the titanium compound thin film and the conventional PCM thin film according to the present invention up to 1000 cycles. In the case of the thin film according to the present invention, the hydrophilic performance was insignificant and the hydrophilic performance (water droplet size of 9 mm or more) was maintained as it is, but in the case of the conventional PCM, it was confirmed that the hydrophilic performance deteriorated rapidly as the number of cycles increased.

According to the present invention, it is possible to easily produce a refrigeration and air conditioning metal material having a thin film having excellent hydrophilic performance and aging characteristics and excellent corrosion resistance on an industrial production scale.

In addition, according to the present invention, it is possible to uniformly form a thin film having effective superhydrophilicity on both sides of the sheet-shaped metal base material.

The features and advantages of the present invention may be better understood with reference to the following accompanying drawings in conjunction with the following detailed description of embodiments of the invention, of which:

1 is a continuous coating of a corrosion-resistant thin film on a sheet-shaped metal base material using a plasma according to an embodiment of the present invention, and subsequently coating a superhydrophilic titanium compound thin film on a sheet-shaped metal base material using a plasma Conceptual diagram showing a device for

Figure 2 is a data showing the deposition rate by the plasma treatment time of the corrosion-resistant thin film according to the present invention.

3 is data showing corrosion resistance performance by plasma treatment time of a corrosion resistant thin film according to the present invention.

Figure 4 is a data showing the plasma formation rate by the degree of vacuum during the plasma treatment of the superhydrophilic thin film and the corrosion-resistant thin film according to the present invention.

5 is data showing the plasma formation rate by the carrier gas during the plasma treatment of the superhydrophilic thin film and the corrosion resistant thin film according to the present invention.

6 is XPS data for analyzing the surface composition of a metal sheet coated with a corrosion resistant and super hydrophilic thin film according to the present invention.

7 is AES data for analyzing the thickness of a coated thin film according to an embodiment of the present invention.

8 is a scanning electron microscope (SEM) photograph showing the microstructure of the titanium compound thin film coated according to an embodiment of the present invention.

9a and 9b are photographs showing the surface state after 15 days after the salt spray test for the Bare Al sheet and the sheet coated with corrosion resistance and superhydrophilic thin film according to the present invention.

10A and 10B are photographs showing the degree of spreading of water droplets when the surface has hydrophilicity (FIG. 10A) and when the surface has hydrophobicity (FIG. 10B) in a test for evaluating hydrophilicity / hydrophobicity of the surface.

FIG. 11 is a graph showing aging characteristics of a sheet coated only with a corrosion resistant layer on the surface and a sheet coated with a corrosion resistant layer and a superhydrophilic layer on the surface.

12 is a graph showing aging characteristics according to time / environmental change of hydrophilicity of a surface in a test for evaluating hydrophilicity / hydrophobicity of the surface.

FIG. 13 is a graph showing aging characteristics of a Bare Al sheet, a conventional PCM sheet, and a sheet coated with a compound thin film according to the present invention.

14 is another graph showing aging characteristics of the sheet coated with the compound thin film according to the present invention and the conventional PCM sheet.

Claims (8)

Si—O— containing 20-25% of Si in atomic percent, coated on the substrate and containing the remainder consisting of at least one of C, H and O and inevitable impurities (O is essentially contained) (C)-(H) type corrosion resistant thin film, Ti-O- (containing atomic%, 15-22% Ti, 45-65% O, and the remainder consisting of at least one of C and H and unavoidable impurities coated on the corrosion resistant thin film) C)-(H) -based superhydrophilic compound thin film, characterized in that the corrosion-resistant and superhydrophilic metal products. The method of claim 1, The corrosion resistant thin film and the compound thin film are corrosion-resistant and super hydrophilic metal product, characterized in that the coating on the metal base material by using a plasma. The method of claim 2, The total thickness of the thin film is corrosion-resistant and super hydrophilic metal product, characterized in that 1 to 200 nm. The method of claim 2, Corrosion-resistant and super hydrophilic metal product, characterized in that the metal base material is an aluminum base material. The method of claim 4, wherein The aluminum base material coated with the thin film in sequence has a sheet shape and can be machined to a desired shape. The method according to any one of claims 1 to 5, The compound thin film is atomic percent, corrosion-resistant and super hydrophilic metal products, characterized in that containing 20 to 25% C. The method according to any one of claims 1 to 5, The compound thin film, atomic percent, containing 20 to 25% H of corrosion-resistant and super hydrophilic metal products. delete

Images